Consider the relations Courses1, Courses2,_Enrollmentand Students.Coursescid enameAl CalculusA2 AlgebraA5 EnglishLocationLIL2L3Student(sid, sname, age, level)Courses2cidASB1B2nameEnglishHistoryb) Courses 1-Courses2L3L4Computing L5(1) Give the results of the following relationalalgebra expressions:a) Teid ( name='History' OR 'Computing (Courses2))c) Courses Courses2Classroomd) Courses1 Enrollmente) Enrollment / Tid (Courses1)Enrollmentsid cid101 Al102 A5103 Bl102 Al102A2CARENA(2) Write the following query in Relational Algebra.a) Find the sids of students who have enrolled incourse Calculus.b) Find the names of students who have enrolled incourse Calculus._c) Find the names of students who have enrolled atleast one course._d) Find the names of students who have enrolled in_Calculus or Algebra.e) Find the sids of students who have enrolled in allcourses (both Courses1 and Courses2).

Answered: Image /qna-images/answer/5542968e-142f-4072-af5b-e1f29c414669.jpg

Consider the relations Courses1, Courses2, Enrollment and Students. Courses Location cid ename Al Calculus LI A2 Algebra L2 AS English L3 Student(sid, sname, age, level) Courses2 cid AS Bl B2 name Classroom English L3 History L4 Computing LS Enrollment sid cid 101 Al 102 A5 103 BI 102 AI 102 A2

Consider the relations Courses1, Courses2, Enrollment and Students. Courses Location cid ename Al Calculus LI A2 Algebra L2 AS English L3 Student(sid, sname, age, level) Courses2 cid AS Bl B2 name Classroom English L3 History L4 Computing LS Enrollment sid cid 101 Al 102 A5 103 BI 102 AI 102 A2

Principles of Information Systems (MindTap Course List)

12th Edition

ISBN:9781285867168

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter5: Database Systems And Applications

Section: Chapter Questions

Problem 4PSE: Using a graphics program, develop an entity-relationship diagram for a database application for an...

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Question

Consider the relations Courses1, Courses2,
_Enrollment
and Students.
Courses
cid ename
Al Calculus
A2 Algebra
A5 English
Location
LI
L2
L3
Student(sid, sname, age, level)
Courses2
cid
AS
B1
B2
name
English
History
b) Courses 1-Courses2
L3
L4
Computing L5
(1) Give the results of the following relational
algebra expressions:
a) Teid ( name='History' OR 'Computing (Courses2))
c) Courses Courses2
Classroom
d) Courses1 Enrollment
e) Enrollment / Tid (Courses1)
Enrollment
sid cid
101 Al
102 A5
103 Bl
102 Al
102
A2
CARENA
(2) Write the following query in Relational Algebra.
a) Find the sids of students who have enrolled in
course Calculus.
b) Find the names of students who have enrolled in
course Calculus.
_c) Find the names of students who have enrolled at
least one course.
_d) Find the names of students who have enrolled in
_Calculus or Algebra.
e) Find the sids of students who have enrolled in all
courses (both Courses1 and Courses2).

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Let R(a,b,c), S(a,b,c), and T(a,b,c) be three relations.Write one or more Datalog rules that define the result of each of the followingexpressions of relational algebra: d) (R U S)- T f) πa,b (R)